Notify Users of Available Updates on PyPI.

[Xieyt]

Description

Implement a feature in Frappe-Manager that checks PyPI for new versions. When a newer version is available, display a notification/message prompting users to update using pip3 install --upgrade frappe-manager.

Use Case

Users benefit from timely notifications for new Frappe Manager versions, ensuring they stay updated with the latest features and improvements.

Expected Behavior

The application will check PyPI for newer versions and notify users within the CLI interface about available updates on each invocation.

Current Behavior (if applicable)

The current Frappe Manager version lacks automated update notifications, requiring users to manually check for updates.

Possible Solution

Introduce a version check mechanism to alert users about available updates during CLI usage.

[Xieyt]

This was implemented in #91 and but removed from the latest release. Will revisit this if required later on.